Last Friday (May 31), the band members spent the day at New York's Electric Lady Studios, along with Danger Mouse, who was completing mixing duties. Also spotted was Coldplay's Chris Martin, although it's unclear whether he will actually be featured on the forthcoming, so far untitled new LP.

In a January 2013 interview with The Sun, Bono proclaimed the new record could take 10 years, as long as the band got it right. However, in an interview last March, bassist Adam Clayton claimed the band was targeting a fall release for the new album.

"We very much want to have a record out by the end of the year, September, October, November; that kind of time," Clayton said. "We're working with Danger Mouse, who's a smart guy. He's on it; he's excited. It's a great team and feels very liberating at the moment -- anything goes. We have an abundance of riches; we could make three or four different records and justify that to ourselves, but to make the best record you can, you have to steer away from the ones you can make easily. We're really trying to get into territory that we're not comfortable in, if that makes sense."

In another recent interview, longtime producer Daniel Lanois commented on new U2 songs, which Bono played for him. "It sounded amazing, very, very big and powerful-sounding," he said. "Some of it was adventurous. There were shades of Achtung Baby."

There is no confirmed title for the album, although Songs of Ascent and 10 Reasons to Exist have been rumored.

The quartet's last album, No Line on the Horizon, came out in 2009 via Interscope, debuting at No. 1 in 30 countries, including the United States.